There are some fun boulders within a couple minutes walk of the parking lot on an obvious trail, but yeah the access is a bit questionable. According to the WSSC website, climbing isn't specifically listed as a prohibited activity but hiking is, and I'm guessing that's what they would call the approach if they wanted to get you on something. That being said, I've never heard of anyone actually getting stopped or ticketed there. I just figure there's enough other decent bouldering in the area that I haven't bothered going there in a few years.